CYTT21403-56LQI44

Overview

The CYTT21403-56LQI44 is a TrueTouch multi-touch capacitive touchscreen controller featuring a 32-bit ARM Cortex CPU. It supports up to 44 sense I/O pins and reports ten simultaneous touch points. The device operates on a digital supply of 1.71–1.95 V or 2.0–5.5 V, with an analog supply of 2.65–4.7 V. Average power consumption is 9 mW, while deep-sleep power is typically 10.7 μW. Communication interfaces include I2C at 100/400 kbps and SPI up to 8 Mbps. It is housed in a 56-pin 6 × 6 × 0.6-mm QFN package.

Feature Summary

• ChargerArmor technology providing immunity up to 35-V peak-to-peak noise
• DualSense technology for water rejection and wet-finger tracking
• Support for passive stylus (2.5 mm) and glove operation
• Automatic baseline tracking and large object rejection

Applications

• Smartphones and tablets
• Portable media players
• Automotive infotainment systems

Procurement Notes

Verify the ordering suffix 'T' indicates tape and reel packaging if required. Confirm the industrial temperature range designation 'I'. Ensure the specific pin count variant matches the design requirements, as this model corresponds to the 44 I/O configuration within the CYTT21X family.

Selection Notes

Select based on the required number of sense I/O pins; this part supports 44 pins. Verify compatibility with the target display type, as it supports LCD, AMOLED, and IPS. Check if ChargerArmor and DualSense features are necessary for the application environment. Consider the available communication interface speed between I2C and SPI.

Part Context

This component belongs to the Cypress Semiconductor CYTT21X/31X TrueTouch family. It shares core architecture with variants offering 40 or 48 I/Os. The '403' code denotes specific feature sets including Stylus support and ChargerArmor. It is designed for integration into mobile and embedded touch applications.

Replacement Considerations

Direct substitutes within the same family include CYTT21401-56LQI44(T) and CYTT21403-56LQI48(T). Cross-family replacements may require firmware adaptation due to register differences. Verify pinout compatibility before substitution.